1. bluetooth transmitter enable your regular stereo audio devices such as a smart TV, desktop PC, laptop, walkman, CD player and even a motocycle be bluetooth available, easily pairing with a bluetooth stereo headphones, earbuds, speakers and other bluetooth enabled audio systems. 2. Features bluetooth V3.0 with A2DP. 3. Built-in rechargeable li-battery, can work for 5~7 hours after fully charged.